package org.smart4j.framework.util;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

/**
 * @author ：Anitaxiaofeng
 * @description：JSON工具类
 * @create 2017-12-15
 **/
public final class JsonUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(JsonUtil.class);

    private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();


    /**
     * 将POJO转为json
     * @param obj
     * @param <T>
     * @return
     */
    public static <T> String toJson(T obj){
        String json;

        try {
            json = OBJECT_MAPPER.writeValueAsString(obj);
        } catch (Exception e) {
           LOGGER.error("convert POJO to JSON failure",e);
           throw new RuntimeException(e);
        }
        return json;
    }

    public static <T> T fromJSON(String json,Class<T> type){
        T pojo;
        try {
            pojo = OBJECT_MAPPER.readValue(json,type);
        } catch (Exception e) {
            LOGGER.error("convert JSON to POJO failure",e);
            throw new RuntimeException(e);
        }
        return pojo;
    }
}
